"Alien" is a song recorded by American singer Sabrina Carpenter and British DJ and record producer Jonas Blue, taken from both the Japanese deluxe editions of Blue's debut album Blue and Carpenter's album Singular: Act I. The track was written by Carpenter, Janee Bennett and its producer Blue. The song was released by Hollywood Records on March 16, 2018. "Alien" describes what it is like to be lost in someone's feelings and how alienating it can be. The song reached number one on Billboard's Dance Club Songs. It was accompanied by a music video directed by Carly Cusson premiered on her Vevo channel on March 29, 2018.